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Sampling requirements for lightfield displays with a large depth of field
Author(s): Tim Borer
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Paper Abstract

Lightfield displays potentially offer a new form of video content providing greater immersion and a stronger sense of presence. Invented by Gabriel Lippman in 1908, lightfield displays can present natural 3D images that have motion parallax in both horizontal and vertical directions. Importantly, they also allow the viewer to focus at different depths within the image, which is not possible with stereoscopic displays. Ideally they require a large depth of field. The depth of field is the range of depths, perpendicular to the display, over which the full resolution of the display (at zero depth) is maintained. To make the best use of lightfield displays we need to know the depth of field and how image resolution decreases outside this range. Prior literature provides an indication of the depth of field for displays with shallow depths of field. Such calculations are based on the Nyquist limit for multidimensional (angular and spatial) sampling. Extrapolating this approach for larger depths of field indicates that an infinite number of elemental pixels would be required to achieve an infinite depth of field. If true this would be a disappointing result. However, such calculations are based on the physical lightfield and do not take account of the observer. Taking account of the observer indicates that only a finite number of elemental pixels are required to achieve an infinite depth of field. This paper presents formulas, and their derivation, for the depth of field of lightfield displays with a large depth of field.

Paper Details

Date Published: 14 May 2019
PDF: 21 pages
Proc. SPIE 10997, Three-Dimensional Imaging, Visualization, and Display 2019, 1099704 (14 May 2019); doi: 10.1117/12.2522372
Show Author Affiliations
Tim Borer, BBC Research and Development (United Kingdom)


Published in SPIE Proceedings Vol. 10997:
Three-Dimensional Imaging, Visualization, and Display 2019
Bahram Javidi; Jung-Young Son; Osamu Matoba, Editor(s)

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